The difference between two-color molds and encapsulated secondary injection molds

The difference between two-color molds and encapsulated secondary injection molds:
A. Two color mold: A mold in which two types of plastic materials are injected into the same injection molding machine and molded in two stages, but the product is only molded once. The processing technology for this type of rubber products is generally called three material injection molding, which is usually carried out by a set of molds and requires a professional two-color injection molding machine.
B. Secondary injection molding mold (secondary molding): Two types of plastic materials may not be injected in the same injection molding machine, and are molded in two stages; After the product is removed from one set of molds, it is then placed in another set of molds for a second injection molding. Therefore, the processing technology for such rubber products is generally carried out using two sets of molds, without the need for professional two-color injection molding machines.
Brief description of two-color molds and encapsulation molds:
The design scheme of the secondary injection mold for encapsulation should pay attention to the precise positioning of the hard plastic product, ensuring that it can be glued and that there are anti tilt holes on the plastic product to avoid deformation due to glue pulling
At present, two-color molds are becoming increasingly popular in the sales market. This type of processing technology can make the appearance of the product more attractive, facilitate color change without the need for painting, but the engineering cost is expensive and the technical standards are high
The two appearances of the cavity are different, each forming one product.
And the two appearances of Core are completely identical.
2. The front and rear molds of the mold must comply with the management center after rotating 180 degrees. When designing the plan, it is essential to adopt this verification posture.
3. Pay attention to the position of the top needle hole, with a minimum spacing of 210mm. For large molds, the total number of top rod holes should be moderately increased. Moreover, due to the insufficient length of the mold ejector pin attached to the injection molding machine itself, it is necessary to design a plan to extend the mold ejector pin in everyone's mold, so that the mold ejector pin extends 150mm above and below the mold blank base.
Two precise positioning rings must be designed on the rear mold base.
4. The total thickness of the front mold control panel and A-plate cannot be less than 170mm. Please carefully check other reference data information for this type of injection molding machine, such as larger mold thickness, minimum mold thickness, and top rod hole spacing.
5. It is best to design the water part of the three board mold in a fully automatic molding posture. Pay special attention to whether the molding posture of the soft glue part is acceptable.
6. The deep layer of the outer SPRUE does not need to exceed 65mm. The distance from the top of the SPRUE above (in large water areas) to the mold management center should not be less than 150mm.
7. In the second injection molding of CAVITY in the design scheme, in order to better prevent CAVITY from inserting (or rubbing) the already formed product adhesive position, a part of the design scheme can be designed to avoid voids. But it is necessary to carefully consider the compressive strength of each sealing position, that is, during injection molding, will there be deformation of the plastic under high injection molding working pressure, which is likely to cause the second injection molding to have a sharp edge?
8. During injection molding, the specifications of the first injection molded product can be slightly larger, so that other products need to be pressed tighter and tighter with another CAVITY during the second molding to achieve the effect of gluing.
9. Pay attention to whether the flowability of the plastic during the second injection molding will be unreasonable, causing deformation of the adhesive position of the product that was already formed in the first injection molding? If this is very likely, we must find ways to improve it.
10. Before merging the A and B boards, pay attention to whether the front mold slider or lifter will calibrate first and crush the product? In this way, it is necessary to find a way to close the molds on board A and B first, and then calibrate the SLIDER or LIFET of the front mold.
11. The water connection layout of the two CAVITY and CORE should be as sufficient and balanced as possible.
12.99% of cases involve injecting a portion of the hard rubber into the product first, followed by injecting a portion of the soft rubber into the product. Due to the easy deformation of soft rubber.